Keyboard



FIG. 1 is a front perspective view of a keyboard;

FIG. 2 is a front view of the keyboard of FIG. 1;

FIG. 3 is a rear view of the keyboard of FIG. 1;

FIG. 4 is a left-side view of the keyboard of FIG. 1;

FIG. 5 is a right-side view of the keyboard of FIG. 1;

FIG. 6 is a top plan view of the keyboard of FIG. 1; and,

FIG. 7 is a bottom plan view of the keyboard of FIG. 1. 

CLAIM The ornamental design for a keyboard, as shown and described. 